Screen.



MTNE'SSE-,l I fluff/fronl MM@ JULHNWCDOMLD f v A, moli, YS

J. R.y MUDONALD.

SCREEN.

APPLIOATIOH FILED SEPT. zz. 191D.

990,578.A Patented Apr. 25,1911.

UNITED sTArEs-PrgrENT OFFICE Jo'HN .In mcnoNALD, .or CIRCLE,wYoMINAssIGNoR Inmo MAXIMILIAN A. 1f1vIosLE,

or NEW YORK, N. In.. .wf

SCREEN.

Specieation of Letters Patent.l

Patented Apr. `25, 1911.

Application filed September 1910. Serial No. 583,152.

To all whom 'it 'may concern.'

Be it known that I, JOHN R. MCDONALD, a citizen of the United States,and a resident of Circle, in the county of Fremont and State of Vyoming,have invented certain new and useful Improvements in Screens, of whichthe following is a clear, full, and exact disclosure.

My invention relates to screensused for protecting rooms, refrigerators,or other inclosed or partly inclosed spaces from flies or other insects.I have observed that when insects light on screens they are usuallytrying to either escape' or enter the screened compartment and willreadily be guided by a slight inclinatiolrof the screen.

One object of my invention is to take4 advantage of this observation andto provide a screen Which can be cheaplyv made and which willrfacilitateall insects lighting on its inner surface to escape and at the same timewill revent insects from entering. A further object of my invention isto so construct the screen that it will not obstruct the View of personslooking through it at an angle tothe screened opening as is the casewith screens of ordinary construction. l

Referring to the drawing accompanying and forming a. part of thisspecification, Figure l is a front elevation of a screen embed ing myimprovements. Fig. 2 is a side e evation of the same. Fig. 3 is anelevation of a door in which is fixed a modified form of screenembodying my invention. Fig. 4 is a side elevation of the same.Referring in detail to the structure shown in Figs. l an'd 2, numeral 1designates a frame of any approved construction suitable in size to fitthe opening to be screened and inwhich is secured the screen 2. Thelatter is made preferably of Wire gauze and is .concave or bulgedoutwardly from the chamber to-be rotected and has a hole 3 at the apex.or common house flies vthis hole should be about three-eighths of aninch in size, while for other insects its size may be varied with` thesize of the insect. The inclination Qf the surface of the screen on itsinner side, due' to its conical or concave fornibn that side, guides theflies or insects "toward thehole in the center through Which theycanreadily pass, While theV inclination of the screen on the out '.deguides them away from' the opening. I have found an inclination of aboutthirty degrees for the screen surface to be satisfactory, though largeror smaller' angles may be employed. It will be seen that With thisconstruction, the insects Wherever they light on the inner surface ofthe screen, are induced by the inclining surface to pass along thescreen in the direction of and through the opening Without being made tochange their course or encountering projections, obstructions or anglesof any kind which would divert them from their course. It will also beobserved that a person on the inside'of the screen, owing to its bulgedconstruction, can see through it in all directions and it is notnecessary to raise the screen in order to observe objects at one side ofthe screen. The screen 2 in the door shown in Figs. 3 and 4 is the sameas that above described, except that the exit opening 3 is located nearthe upper side of the screen, Which arrangement is an advantage in somecases due to the tendency of insects to travel toward the upper side'ofthe screen after lighting. This form is also desirable in some casesbecause the bulged or projecting part of the screen is raised so highthat it will not inconvenience users of the door. In Some cases wherelong horizontal openings such as transoins are to be screened, aplurality of screens such asthat shown in Fig. 1 may be placed side byside or a single screen may be formed with a plurality of bulges andcorresponding openings.

IVhile I have illustrated andfdescribed a screen made of wire gauze, itis obvious that it may be Inade of other material such as sheet metal orevenfof glass and may be perforated or solid.

It Will be observed that my screen can be formed by stamping orotherwise out of a single sheet of gauze and may be secured in a frame'ot' ordinary construction and is free of complicated parts andunsightly attachments.

Other modications may be made in my improved screen without departingfrom the spirit of my invention or the scope of my claims.

That I claim is:

1. A device of the kind described, comprising :t frame, a screen securedtherein bulged outwardly, with an opening at the apex ofthe bulge, theinner surface ofthe screen bei'pg unobstructed and inclinedoutwerdIy-from the sides of the frame to the sides of the frame to theopening, substanopenng, substantially as described. tally as described.

2. A device of the kind described com- T prsu1g-eframe,a Cone-ShapedVscreen Secured JUHB R' MCDONALD j) 'therein' with an opening at theapex, the Vitnesses:

inner surface of the screen being unob- ,BENI BLAGG,

strueted and inclined outwardly from the Ross HODPINQAMER.

